Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
5.50-5.902.33-2.37
1
7.18
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Fracture
Conchoidal
ConchoidalWalter Schumann
Cleavage
On {10 1 0}, perfect; parting on {000 1 }
Perfect on {010}, good on {100}
Mohs Hardness
47.5
2
10
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Chemical Composition
(Zn,Mn2+ )OMichael OâDonoghue , Gems, Sixth Edition (2006)
Be 2BO 3(OH)Ulrich Henn and Claudio C.